May 26, 2021 · For better growth of the calves, grain mixture is very helpful. You can start feeding the calves grain mixture at their age of 7 to 15 days. You have to prepare this mixture in such a way so that it contain a medium amount of protein. For preparing a grain mixture for your calves, use 20% of groundnut cake, 35% oats, 5% linseed cake, 10% barley